The Indus Valley culture had a form of writing, evidenced by numerous seals found in the ruins. On the assumption of the Aryan invasion it was assumed to be non-Vedic and probably Dravidian, though this was never proved. Now it has been shown that the majority of the late Indus signs are identical with those of early Brahmi, the oldest Sanskritic script, and that there is an organic development between the two scripts. The scripts show a continuity which suggests that they reflect the same language and culture.

Prevalent models, primarily the work of Subhash Kak, show an Indo-European basis for that language.(*43) This is based on a discovery that the script uses a genitive (possessive) case, which is typical of Indo-European but not Dravidian languages. However there are not yet long enough inscriptions to guarantee a proper decipherment. Based upon the location of the culture Subhash Kak is suggesting that the script be renamed "Sarasvati script."